Short course radiation therapy for rectal cancer in the elderly: can radical surgery be avoided?
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1 Short communication Short course radiation therapy for rectal cancer in the elderly: can radical surgery be avoided? Michael A. Cummings 1, Kenneth Y. Usuki 1, Fergal J. Fleming 2, Mohamedtaki A. Tejani 3, Alan W. Katz 1 1 Department of Radiation Oncology, 2 Department of Colorectal Surgery, 3 Department of Medicine, Division of Hematology/Oncology, University of Rochester Medical Center, Rochester, NY, USA Correspondence to: Michael A. Cummings. Department of Radiation Oncology, University of Rochester Medical Center, Rochester, New York, USA. michael_cummings@urmc.rochester.edu. Abstract: Rectal cancer in elderly patients can be difficult to manage. Short course radiation therapy (SCRT) has shown to be effective when given immediately prior to surgery. Here we report outcomes of elderly patients who underwent SCRT either alone or prior to resection. Between 2010 and 2015, elderly patients with rectal cancer and no distant metastatic disease were identified. Symptoms at diagnosis, therapies, toxicities, and pathologic and clinical response were recorded from patient charts. The SCRT prescription dose was 5 Gy 5 to the rectal tumor and 4 Gy 5 to the mesorectum, omitting the iliac nodes. Twenty patients were identified with median age of 85 years (range, years). No patient received systemic therapy. Sixty percent of patients were ct3 at diagnosis. Half underwent resection post SCRT and half received SCRT as definitive therapy. The 1- and 2-year overall survival was 75% and 54%. Overall survival did not differ between patients treated with SCRT and surgery compared to SCRT alone (P=0.8). Of the 10 surgical patients, 3 had a complete pathologic response at time of resection and 3 patients died within 2 weeks due to perioperative complications. Of patients treated with SCRT alone, 8 were symptomatic at presentation and 5 had a clinician defined symptomatic response. No patient treated with SCRT monotherapy required additional palliative measures for outflow obstruction, but 2 progressed locally and died. SCRT is well tolerated, results in pathologic complete responses in a small percentage of patients, and achieves 63% symptom improvement rate as monotherapy. A high peri-operative complication rate was observed in this small series. In elderly patients, SCRT as initial treatment with a watch and wait approach for surgery is feasible and should be evaluated prospectively. Keywords: Elderly; short course radiation therapy; rectal cancer Submitted Jul 16, Accepted for publication Aug 31, doi: /jgo View this article at: Introduction Rectal cancer is a disease of the elderly, with the median age at diagnosis 69 years in men and 73 years in women per the American Cancer Society data. The standard treatment for stage II and III disease in the United States typically consists of neoadjuvant long course chemoradiation therapy followed by surgical resection (1). An alternative is short course radiation therapy (SCRT), which has shown to be comparable in effectiveness (2). In elderly patients with multiple comorbidities, the potential toxicities of chemoradiation therapy followed by surgery can be prohibitive. Further, population based data has shown higher peri-operative complications specifically following definitive surgery specifically for rectal cancer in patients >70 years of age (3). In our institution, SCRT has been used, sometimes alone, to treat elderly patients who were not suitable candidates for chemoradiation neoadjuvant therapy.
2 2 Cummings et al. SCRT for rectal cancer in the elderly Table 1 Patient characteristics Variables Methods Patients Under an institutional review board approved protocol patients >70 years of age with pathologic diagnosis of rectal cancer who received SCRT were retrospectively identified. Majority of patients were staged by endorectal ultrasound (EUS) or magnetic resonance imaging (MRI). Radiation treatment SCRT was delivered in 5 fractions. Treatment was delivered by intensity modulated radiation therapy (IMRT) with 20 Gy/5 fractions to the mesorectum PTV and 25 Gy/5 fractions to the primary tumor PTV. No treatment was directed to the iliac nodes. Acute toxicities were graded by Common Terminology Criteria for Adverse Events (CTCAE) version 4. Surgery Surgery was either abdominoperineal resection (APR), low anterior resection (LAR), or trans-anal endoscopic microsurgery (TEMS) performed in a high volume, tertiary hospital. Response assessment Number or median [range] Male 11 Female 9 Age at SCRT (years) 85 [71 93] KPS 70 [50 100] Symptomatic at presentation 16 Staging MRI/EUS 18 Distance from anal verge (cm) 6.5 [1 12.5] Tumor size (cm) 4 [2 11.2] Closest CRM (mm) 0.5 [0 10] Pathologic response was assessed by quantitation of residual tumor, necrosis, and lymphocyte infiltrate as per practice of the pathology department. Clincal tumor response was assessed by MRI, CT or PET-CT scans using RECIST criteria, colonoscopy, and/or digital rectal examination. Symptomatic response of SCRT monotherapy patients was assessed by radiation oncology or colorectal surgery providers. Statistical methods Overall and progression free survival were evaluated by Kaplan-Meier and compared by log-rank, with a P value <0.05 set as significant. Results Twenty patients were identified (Table 1). Median follow up with clinical exam including CEA, imaging, or colonoscopy was 12 months No patient had metastatic disease at time of radiation. Rationale for SCRT was frailty (at least 2 significant co-morbidities) in 7 patients, cardio-pulmonary comorbidity in 5, quality of life concerns/lack of social support in 3, dementia with residence in a skilled nursing facility in 3, and chronic kidney disease in 2. Median overall and local progression-free survival at 1 and 2 years was 75% and 54%, and 70% and 54% respectively. There was no significant different in survival between patients who received surgery, and those treated with SCRT alone (P=0.8). Patients treated with SCRT monotherapy Ten patients were treated with SCRT alone (Table 2). One was planned for LAR but had a complete response by colonoscopy. Two patients died as a result of progressive colorectal cancer at ages 90 and 93, respectively both approximately 5 months after SCRT. Of the 8 SCRT monotherapy patients symptomatic at presentation, 5 had a clinician determined symptomatic response (Table 3). The two asymptomatic patients did not develop symptoms post-treatment. No patient developed isolated pelvic node recurrence. Patients treated surgically Ten patients underwent surgery (Table 3). Surgery was not implemented as salvage. One patient classified as a pcr received SCRT and subsequent LAR after an upfront TEMS left gross residual disease. Five patients were deemed to have down-staging. Three patients had post-surgical complications; 2 with partial small bowel obstruction, one requiring ileostomy, and third with
3 Journal of Gastrointestinal Oncology, Table 2 Patients and response by treatment Variables SCRT monotherapy SCRT and surgery N Age [range], years 88 [74 93] 81 [71 89] KPS Stage T2N0 3 4 T3N0 6 6 T3N1 1 0 Tumor response 9 evaluable patients 10 evaluable patients Complete 3 1 by colonscopy with negative biopsy (4 months), 1 by colonscopy with no lesion to sample (6 months), 1 by colonoscopy with no lesion and PET-CT (10 months) 2 (LAR) interval between SCRT and surgery of 3 and 8 weeks respectively Partial 4 2 by colonscopy and MRI (9 and 12 months), 1 by PET-CT (10 months), 1 by MRI (6 months) 5 (3 APR, 1 LAR, 1 TEMS) 4 with interval between <1 and 2 weeks, 1 with 35 weeks to TEMS Progressive disease 2 by imaging and clinical exam (4 and 5 months) No response 2 (3 LAR) interval <1 week for all patients Death from CRC 2 0 Surgical mortality 3 Table 3 Presenting symptoms and response Presenting symptom (individual patients) Clinician-defined symptom response Interval to last symptom assessment (months) Intermittent BRBPR (<1 episode per day) Complete resolution 14 Tenesmus, frequency >6 /day, hematochezia Urgency with incontinence, frequency >4 /day, rectal pain Complete resolution, but hospitalized 15 months post treatment with obstructive symptoms with patent lumen/tumor partial response Urgency and incontinence resolved, frequency improved but still present 16 3 Hematochezia with symptomatic anemia causing hospitalization, tenesmus Complete resolution of hematochezia 1 Incontinence, tenesmus Tenesmus resolved, no change in continence 3 Incontinence Resolution for 7 months, then recurred with new hematochezia 8 BRBPR with all stools, asymptomatic anemia Complete resolution 11 BRBPR with all stools, tenesmus BRPRB reduced to 1 /week, complete resolution of tenesmus 18 hemorrhage requiring adrenalectomy. No patient who underwent surgery died from CRC, and 1 developed oligometastatic disease to the liver. Three patients died from surgical complications; two at age 83 and 79 secondary to post-operative myocardial infarction, both during the admission for surgery, and one at age 87 due to infection within 2 weeks. There were no intraoperative complications noted for these 3 patients.
4 4 Cummings et al. SCRT for rectal cancer in the elderly Radiation related toxicity Fifteen patients reported no toxicity, three had exacerbation of diarrhea consistent with CTCAE Grade 2 proctitis, and one patient with severe baseline symptoms developed Grade 3 proctitis. One patient had symptoms consistent with CTCAE Grade I cystitis. No patient required hospitalization for toxicity management. Discussion Rectal cancer is often symptomatic (80% of patients in this series were symptomatic at presentation) and presents difficult management decisions. Unlike symptoms from prostate cancer, also common in the elderly, which may have urinary side effects or even metastatic disease managed with relatively well tolerated hormonal therapy, the choice of therapy for frail patients with rectal cancer is more onerous. This short series is the first report to our knowledge demonstrating the potential utility of SCRT monotherapy as up-front therapy in elderly patients. Previous reports have shown that SCRT decreases the local recurrence rate with the use of total mesorectal excision (4); however, population-based analyses of have not shown a benefit of TME surgery in elderly patients (>74 years of age), which correlated with increased 30- and 60-day mortality (3). Our data support the vulnerability of older patients, with a quite high rate of complications and 3 peri-operative deaths. Generalization is limited with small number of patients, but even in a tertiary hospital with a multidisciplinary team it is difficult to predict which patients will tolerate intensive therapy. The anti-tumor effect of SCRT in rectal cancer also increases with time. A report of older patients with T4 lesions showed high rates of R0 resection and pathologic down staging in at least 58% of patients who did not receive systemic therapy with mean time to surgery approximately 6 weeks (5). Analysis of the Stockholm III trial, a randomized trial with 2 arms of different intervals between SCRT and resection, reported an 11.8% complete pathologic response rate with surgery delayed 4 8 weeks post treatment, compared to 1.7% for immediate surgery (6). In this series the patients who had a complete response all had an interval of at least 3 weeks post SCRT, and the patients who had a complete response in the nonsurgical group maintained this for at least 6 months. The fact that there was progression in 2 patients also highlights that there are risks. Reports also show the efficacy in symptomatic management with SCRT. A prospective trial of 18 patients with obstructive disease reported excellent patientidentified symptomatic response following SCRT as monotherapy with low rates of acute toxicities, though a slightly higher rate of grade 3 proctitis compared to this series (16% vs. 5%) (7). Patients in this series were in less dire circumstances, but also had favorable symptomatic responses. Blood loss either completely resolved or substantially improved in 5/8 monotherapy patients with this symptom, and no patient required transfusions after SCRT. Radiation was well tolerated with minimal acute effects and no hospitalizations, including 3 patients with dementia already in a skilled facility. A less invasive surgical procedure, TEMS, has been studied as an alternative option and comes with some risks. TEMS is inadequate control as monotherapy for T2 lesions (8), and interest in combining SCRT with TEMS has been tempered by high wound dehiscence rates of 13 50% (9,10). We acknowledge the limitations our study, including the retrospective nature, lack of uniform follow up, and small numbers. However, the tolerability, symptomatic improvement, and proportion of patients needing no further intervention support SCRT as initial therapy in elderly patients, followed by scheduled surveillance. A prospective trial is being developed to address this question in elderly patients. Conclusions SCRT is a well-tolerated, effective regimen for rectal cancer in the very elderly with a small but real pathologic complete response rate and symptom improvement without further local therapy. SCRT followed by a watch and wait warrants further evaluation in prospective trials. Acknowledgements We would like to acknowledge Laura Finger for assistance in preparing this manuscript. Footnote Conflicts of Interest: The authors have no conflicts of interest to declare.
5 Journal of Gastrointestinal Oncology, References 1. Sauer R, Becker H, Hohenberger W, et al. Preoperative versus postoperative chemoradiotherapy for rectal cancer. N Engl J Med 2004;351: Ngan SY, Burmeister B, Fisher RJ, et al. Randomized trial of short-course radiotherapy versus long-course chemoradiation comparing rates of local recurrence in patients with T3 rectal cancer: Trans-Tasman Radiation Oncology Group trial J Clin Oncol 2012;30: Rutten HJ, den Dulk M, Lemmens VE, et al. Controversies of total mesorectal excision for rectal cancer in elderly patients. Lancet Oncol 2008;9: Kapiteijn E, Marijnen CA, Nagtegaal ID, et al. Preoperative radiotherapy combined with total mesorectal excision for resectable rectal cancer. N Engl J Med 2001;345: Radu C, Berglund A, Påhlman L, et al. Short-course preoperative radiotherapy with delayed surgery in rectal cancer - a retrospective study. Radiother Oncol 2008;87: Pettersson D, Lörinc E, Holm T, et al. Tumour regression in the randomized Stockholm III Trial of radiotherapy regimens for rectal cancer. Br J Surg 2015;102:972-8; discussion Picardi V, Deodato F, Guido A, et al. Palliative Short- Course Radiation Therapy in Rectal Cancer: A Phase 2 Study. Int J Radiat Oncol Biol Phys 2016;95: Elmessiry MM, Van Koughnett JA, Maya A, et al. Local excision of T1 and T2 rectal cancer: proceed with caution. Colorectal Dis 2014;16: Smart CJ, Korsgen S, Hill J, et al. Multicentre study of short-course radiotherapy and transanal endoscopic microsurgery for early rectal cancer. Br J Surg 2016;103: Arezzo A, Arolfo S, Allaix ME, et al. Results of neoadjuvant short-course radiation therapy followed by transanal endoscopic microsurgery for t1-t2 n0 extraperitoneal rectal cancer. Int J Radiat Oncol Biol Phys 2015;92: Cite this article as: Cummings MA, Usuki KY, Fleming FJ, Tejani MA, Katz AW. Short course radiation therapy for rectal cancer in the elderly: can radical surgery be avoided? J Gastrointest Oncol doi: /jgo
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